I have recently changed one of the page from new_page?(parameters) to video.php?(parameters)
My questions are,
Please help. Thanks in advance.
Instead of redirecting to a 404, make the old pages do a 301 redirect to the new pages. A 301 status code means the page has permanently moved. This way you will not lose value on your old links.
You can read more on webmaster tools
This is how it is done in php:
file: old_page.php
$url = "new_page.php?".$_SERVER['QUERY_STRING'];
header("Location: ".$url,true,301);
You can also do it in your .htaccess
file.